All bank interest is reported to the IRS even if it is less than $10 ... the banks do not need to issue a 1099-INT to the account owner but it is still reportable income.
The $600 limit you mention is for 1099-nec forms to be issued and it went into affect for 2022 however many companies filed them in 2021 HOWEVER all total taxable worldwide income needs to be reported even if no tax form is issued.
